− z 2 a 12 + 2 z 4 a 10 + 3 z 2 a 10 + a 10 − z 6 a 8 − 4 z 4 a 8 − 8 z 2 a 8 − 5 a 8 + z 6 a 6 + 7 z 4 a 6 + 11 z 2 a 6 + 5 a 6 {\displaystyle -z^{2}a^{12}+2z^{4}a^{10}+3z^{2}a^{10}+a^{10}-z^{6}a^{8}-4z^{4}a^{8}-8z^{2}a^{8}-5a^{8}+z^{6}a^{6}+7z^{4}a^{6}+11z^{2}a^{6}+5a^{6}}
